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Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Associated With Level 3 Financial Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2023
Asset-Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 2,124 | $ 2,179
Realized gains/(losses) | 220 | 226
Redemptions | (365) | (426)
Net change | (145) | (200)
Ending Balance | 1,979 | 1,979
Syndicated Loans [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 93,591 | 69,888
Unrealized gains/(losses) | (22) | 86
Realized gains/(losses) | 61 | (73)
Purchases | 23,395 | 54,760
Sales | (2,466) | (4,569)
Redemptions | (9,018) | (14,551)
Net change | 11,950 | 35,653
Ending Balance | 105,541 | 105,541
Corporate Equity Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 11,878 | 11,878
Net change | 0 | 0
Ending Balance | 11,878 | 11,878
Auction Rate Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 14,680 | 14,681
Unrealized gains/(losses) | 3 | 2
Net change | 3 | 2
Ending Balance | 14,683 | 14,683
Other Investment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 37,368 | 36,974
Unrealized gains/(losses) | (26) | 368
Net change | (26) | 368
Ending Balance | $ 37,342 | $ 37,342

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis realized asset gain loss included in earnings. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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